Question

if the first side if triangle is 25° and second side is 30° find the value of third side​

Answer 1

Answer:

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Step-by-step explanation:

The measures of two angles of a triangle are 72° and 58°. 

Let the third angle be x. 

Now, the sum of the measures of all the angles of a triangle is 180o.

 ∴∴    x + 72o + 58o = 180o

    ⇒ x + 130o = 180o                   

    ⇒ x = 180o −- 130o

    ⇒ x = 50o

The measure of the third angle of the triangle is 50o.

Answer 2

∠A + ∠B + ∠C = 180

25 + 30 + ∠C = 180

∠C = 180 - 55

∠C = 125