Question

if the 1st and 3rd angle of a triangle is 40° and 90°. find the 2nd angle ​

Answer 1

angle sum property of a triangle : sum of all angle in a triangle equals 180 °

=> 40° + 90°+ angle 2 = 180 °

angle 2 = 180° - 130 °

angle 2 = 50°

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Answer 2

Answer:

50°

Step-by-step explanation:

According to the Angle Sum Property of triangle, the sum of all three angles is 180°.

Given, 1st angle = 40°, 3rd angle = 90°

Let the second angle be x.

=> 40° + x + 90° = 180°

=> 130° + x = 180°

=> x = 180° - 130°

=> x = 50°

Therefore, the 2nd angle is 50°.