Question

Find the value of x in the triangle shown below. X = 80° 7 7 29 9

Answer 1

Identity to remember .

☆ We know that angles of triangle opposite of its equal sides are also equal

Here the information that we know about the given triangle is

• One Angle is 80°

• Sides are 7 , 7 and 9

So the angles opposite to the equal sides will be equal .

→ So one of those equal angle is x so other will also be x .

☆ Interior angle sum property states that sum of interior angles of triangle will be 180°

→ 80° + x + x = 180°

→ 2x = 180°-80°

→ 2x = 100°

→ x = 100/2

→ x = 50° .

• So the value of x is 50°.