Question

In a triangle, one angle measures 20 degree and the other measures 70 degree. Find the measure of the third angle.
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Answer 1

Answer:

the other 2 angles are 65° & 45°

Step-by-step explanation:

one angle of triangle = 70°

so, the sum of the other 2 angles = 180 - 70 = 110°

Other 2 angles are considered as x & x-20

& x + x-20 = 110

=> 2x - 20 = 110

=> 2x = 130

=> x = 130/2 = 65°

& x-20 = 65–20 = 45°

So, the other 2 angles are 65° & 45°

Answer 2

Given,

First angle=20°

Second angle=70°

To find,

Measure of third angle.

Answer,

90°

Explanation,

Remember,the total measure of a triangle is 180°.

Let the third angle as y.

20+70+y=180

90+y=180

y=180-90

y=90

Hence the answer is 90°.