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3 years ago

13

The second angle of a triangle is three times as large as the first. the third angle is 20 degrees less than the sum of the othe

r two angles. find the measure of the first angle.

1 answer:

timama [110]3 years ago

6 0

The first angle is 25 degrees
25+75=100
100-20=80
100+80=180

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(I'm helping someone else) Is a triangle with sides of length 6 ft., 21 ft., 23 ft. a right triangle? Show how you know.

MaRussiya [10]

This is not a right triangle.

4 0

3 years ago

Read 2 more answers

The distance on a map between Lynwood and Forest Hill is 3.75 inches. According to the map key, 0.25 inch on the map is equivale

Volgvan

Answer:

15 miles

Step-by-step explanation:

To find the actual distance in miles between Lynwood and Forest Hill, we can use a rule of three:

If 0.25 inch on the map is equivalent to 1 mile, then 3.75 inch on the map is equivalent to what distance:

0.25 inch -> 1 mile

3.75 inch -> X miles

0.25/3.75 = 1/X

X = 3.75/0.25 = 15 miles

The actual distance between Lynwood and Forest Hill is 15 miles.

7 0

4 years ago

Elza [17]

Answer:

Perimeter is 126cm and area is 972 $cm^2$

Step-by-step explanation:

Scale factor means you multiply the dimensions by the factor. In this case 4.5

The width 6cm becomes 27cm. The length 8cm becomes 36cm.

Perimeter = 2*L + 2*W, L is length and W is width.

$P=27*2cm+36*2cm\\P=54cm+72cm\\P=126cm$

Area = L*W

$A=27cm*36cm\\A=972cm^2$

8 0

3 years ago

A rectangle has an area of 8 square centimmetres and a perimeter of 12 cm. What are the width and breath?

vlada-n [284]

Let the Length be L and the Width be W

The area is 8 cm²
LW = 8

The perimeter is 12
2(L + W) = 12
L + W = 6

Solve L and W:
LW = 8 --------------- (1)
L + W = 6------------ (2)

Equation (2):
L + W = 6
L = 6 - W -------------- Sub into (1)
(6 - W) W = 8
6W - W² = 8
W² - 6W + 8 =0
(W -2 )(W - 4) = 0
W = 2 or 4

When W =2, L = 6 - 2 = 4
When W = 4, L = 6 - 4 = 2

Answer: The Width is 2 cm and the Length is 4 cm

8 0

3 years ago

A normal distribution has \mu = 65 and \sigma = 10. Find the probability that the average score of a group of n = 4 people is be

Kipish [7]

Answer:

The probability that the average score of a group of n = 4 people is between 70 and 75=0.13591

Step-by-step explanation:

We are given that

$\mu=65$

$\sigma=10$

n=4

We have to find the probability that the average score of a group of n = 4 people is between 70 and 75.

$P(70$

$=P(\frac{5}{5}$

$=P(1$

$=P(Z$

$=0.97725-0.84134$

$=0.13591$

Hence, the probability that the average score of a group of n = 4 people is between 70 and 75=0.13591

4 0

3 years ago