Question

If the two angles of a triangle are 80° and 50°, respectively. Find the measure of the third angle.
A. 50°
B. 60°
C. 70°
D. 80°

Answer 1

Answer:

A. 50°

Step-by-step explanation:

let the other angle be x

therefore

80 + 50 + x = 180 (angle sum property)

130+x = 180

x = 180-130

x = 50

Answer 2

SOLUTION

TO CHOOSE THE CORRECT OPTION

If the two angles of a triangle are 80° and 50°, respectively. Find the measure of the third angle.

A. 50°

B. 60°

C. 70°

D. 80°

EVALUATION

Here it is given that the two angles of a triangle are 80° and 50°, respectively.

Let the measure of the third angle = x

We know that the sum of three angles of a triangle is 180°

So by the given condition

80° + 50° + x = 180°

⇒ 130° + x = 180°

⇒ x = 180° - 130°

⇒x = 50°

FINAL ANSWER

Hence the correct option is A. 50°

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