1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andre [41]
3 years ago
13

In isosceles triangle ∆ABC,

Mathematics
1 answer:
Hitman42 [59]3 years ago
3 0
Check the picture below.

the triangle is an isosceles, meaning it has two twin sides, that make two twin angles, namely AB = BC, and the angles at A and C are twins as well.

now, the AD segment, is an angle bisector, meaning it cuts the angle at A in two equal halves, so if say the angles are x° each, then the bisectors cuts it in (x/2)°.

now, we know ∡ADB is 110°, therefore its supplementary angle, in green, is 70°.

recall that the sum of all interior angles in a triangle is 180°, thus

\bf 70~+~\cfrac{x}{2}+x=180\impliedby \textit{let's multiply both sides by the LCD 2}
\\\\\\
2\left( 70~+~\cfrac{x}{2}+x \right)=2(180)\implies 140+x+2x=360
\\\\\\
3x=220\implies x=\cfrac{220}{3}\implies x=73\frac{1}{3}\\\\
-------------------------------\\\\
\measuredangle B+x+x=180\implies \measuredangle B+\cfrac{220}{3}+\cfrac{220}{3}=180
\\\\\\
\measuredangle B=180-\cfrac{440}{3}
\implies 
\measuredangle B=\cfrac{540-440}{3}\implies \measuredangle B=\cfrac{100}{3}
\\\\\\
\measuredangle B=33\frac{1}{3}

You might be interested in
Olivia family drove to Disney land For spring break. Her mom and dad shared the driving duties for a total of 14 hours. her mom
Kay [80]

Mom drove for 11 hours.

Dad drove for 3 hours.

<u>Step-by-step explanation</u>:

  • Total hours = 14 hours
  • Total distance = 895 miles
  • Mom drove a speed of 65 mph
  • Dad drove a speed of 60 mph

Let 'x' be the number of hours drove by mom.

Let 'y' be the number of hours drove by dad.

x + y = 14     ---------------(1)

65x + 60y = 895  ---------(2)

Multiply eq(1) by 60 and subtract eq(2) from (1),

60x + 60y = 840

-(<u>65x + 60y = 895</u>)

 <u> -5x   = -55    </u>

x = 55/5

x = 11

∴ Mom drove for 11 hours.

Substitute x=11 in eq(1)

11+y = 14

y = 3

∴ Dad drove for 3 hours.

6 0
3 years ago
Sam opened a savings account with an initial deposit of $2,000. Since then, he has never made any other deposits or withdrawals.
notsponge [240]
If my math is correct B or C is what it comes down to
7 0
2 years ago
Read 2 more answers
For questions 8 – 10, answer the questions about tangent-tangent angles.
olchik [2.2K]

Answer:

m(arc ZWY) = 305°

Step-by-step explanation:

8). Formula for the angle formed outside the circle by the intersection of two tangents or two secants is,

Angle formed by two tangents = \frac{1}{2}(\text{Difference of intercepted arcs})

                                                   = \frac{1}{2}(220-140)

                                                   = \frac{1}{2}(80)

                                                   = 40°

9). Following the same rule as above,

Angle formed between two tangents = \frac{1}{2}(\text{Difference of intercepted arcs})

125 = \frac{1}{2}[m(\text{major arc})-m(\text{minor arc})]

250 = [m(\text{arc ZWY})-m(\text{arc ZY})]

250 = m(arc ZWY) - 55

m(arc ZWY) = 305°

Therefore, measure of arc ZWY = 305° will be the answer.

10). m(arc BAC) = \frac{1}{2}([m(\text{arc BDC})-m(\text{arc BC})])

                          = \frac{1}{2}(254-106)

                          = \frac{148}{2}

                          = 74°

4 0
2 years ago
Select the postulate of equality or inequality that is illustrated.
Airida [17]
Hello,
"<" is transitive.
a<b
b<2 ==>a<b<2==>a<2

4 0
3 years ago
Read 2 more answers
Will correctly calculated 45 ÷ 6 as 7.5. How can he find 4,500 ÷ 6 without dividing?
Anastasy [175]
Add the zeros on to 7.5 to which you would move the decimal and it should be like this 750.0 or 750
5 0
3 years ago
Other questions:
  • At noon, the shadow of a flagpole is 10 feet long. At the same time, the shadow of a 140-foot tall building is 60 feet long. Wha
    7·1 answer
  • What two simpler problems can you use to find 9 x 38?
    6·2 answers
  • Find the equation of the line.
    8·1 answer
  • What is the middle of a circle called
    5·1 answer
  • A bus travels 30 miles in 40 minutes.how many miles does the bus travel in 60 minutes at this rate?
    10·2 answers
  • How do you get the answer?
    15·2 answers
  • If the spinner to the right is spun once, what is the probability
    11·1 answer
  • The ratio of teachers to students in a particular school is 5 to 26. The ratio of female students to the total number of student
    6·1 answer
  • 100÷4×3-1-100<br><img src="https://tex.z-dn.net/?f=14%20%2B%209%20-%203%20%5Ctimes6%20-%20100" id="TexFormula1" title="14 + 9 -
    14·1 answer
  • The area of a storage shed floor is 20 ft2. The length is 3 more than twice the width. Find the dimensions of the storage shed f
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!