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Grace [21]
3 years ago
10

One angle of a triangle has a measure of 36°. The measure of the third angle is 28° less than 3 times the measure of the second

angle. The sum of the angle measures of a triangle is 180°.
1) Define your variable. Write your equation and solve. (No justification necessary.)

2) What is the measure of the second angle?

3) What is the measure of the third angle?
Mathematics
1 answer:
Alex_Xolod [135]3 years ago
8 0

Answer:

  1. Define your variable and write your equation:  36 + b + (3b-28) = 180°.
  2. measure of the second angle: 43°.
  3. measure of the third angle: 101°

Step-by-step explanation:

a = 36

c = 3b - 28

a + b + c = 180°

a = measure of the first angle

b = measure of the second angle

c = measure of the third angle

then:

1)  36 + b + (3b-28) = 180   ⇒ )Define your variable. Write your equation and solve)

b + 3b + 36 - 28 = 180

4b + 8 = 180

4b = 180 - 8

4b = 172

b = 172/4

2)   b = 43°        ⇒   measure of the second angle

c = 3b - 28

c = 3*43 - 28

c = 129 - 28

3) c = 101°      ⇒   measure of the third angle

Check:

36° + 43° + 101° = 180°

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