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gavmur [86]
3 years ago
12

If triangle DEC congruent to triangle BEC, which is true by CPCTC?

Mathematics
2 answers:
IceJOKER [234]3 years ago
8 0

Answer:

The correct answer is the second one

Step-by-step explanation:

Line BE and ED are congruent because they are the same length and E is the mid line.

Nina [5.8K]3 years ago
8 0

Answer:

second option is correct

Step-by-step explanation:

By the given

ΔDEC≅ΔBEC

which means triangle DEC is congruent to triangle BEC

then by CPCTC (corresponding parts of congruent triangle are congruent)

there every side and angle of DEC will be equal to BEC

⇒BE= DE (by CPCTC)

hence second option is correct

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anastassius [24]

Option D:

Right triangle

Solution:

Let us first define obtuse, acute right triangle and supplementary.

<u>Obtuse angled triangle:</u>

If any one of the angle in the triangle is more than 90°, then the triangle is an obtuse angled triangle.

<u>Acute angled triangle:</u>

If all the angles of the triangle are less than 90°, then the triangle is an acute angled triangle.

<u>Right angled triangle:</u>

If any one of the angle in the triangle is exactly 90°, then the triangle is a right angled triangle.

<u>Supplementary:</u>

If sum of the angles is 180°, then the angles are supplementary angles.

But this is not a kind of triangle.

In given triangle one of the angle is 90°.

Therefore, this is a kind of right triangle.

Option D is the correct answer.

8 0
4 years ago
Find the lateral surface area of the cylinder. Round your answer to the nearest tenth.
GuDViN [60]

Answer:

113.1 unit²

Step-by-step explanation:

A cylinder is a shape with two round ends and two parallel lines connecting the round ends.

Height=9  unit, Base=4 unit

The lateral surface area of a cylinder (A) is given by the equation:

A=2\pi rh

where r is the radius of the cylinder and h is the height of the cylinder.

Given that the base = 4 unit, therefore the diameter (d) = base = 4 unit. Also the height (h) = 9 unit.

Radius (r) = d/2 = 4/2 = 2 unit

Calculating the area of the cylinder is as follows

A=2\pi rh\\A=2\pi*2*9\\A=113.1

The area of the cylinder is 113.1 unit²

8 0
3 years ago
Anna's Savings Dollars Saved 4 8 Dollars Spent 6 12 18 24 Dollars Earned 10 30 40 Anna walks dogs to earn money. She saves $4 fo
Anastasy [175]

Answer: is b peoples i repeat people who dont

know nothing its b b b b bb b b b b b b b b

Step-by-step explanation:

4 0
3 years ago
Solve using substitution <br> y= x+4<br> x-y= -4
never [62]
X-(x+4)=-4

X-x-4=-4
-4=-4

All real numbers
6 0
4 years ago
Bethany and Heather ran a mile in gym
Ad libitum [116K]

Answer:

77

Step-by-step explanation:

to start off the "difference" is the way to say total in subtraction

you would have to subtract 87 and 10 to find the difference

87 - 10 = 77

77 is the difference between their times

8 0
4 years ago
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