Question

(d) angle P = 140°, angle Q = angle R find the unknown angle and classify the triangle on the basis of angle
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Answer 1

Answer:

the sim of angle of triangle is 180⁰

140⁰-180⁰=40⁰

=40⁰/2=Q and R

each unknown angle =20⁰

Answer 2

Answer:

angle Q = 20 degrees

angle R = 20 degrees

This is an Isoceles Triangle

Step-by-step explanation:

~ The angle Sum Property of triangle is that, sum of all angles in a triangle = 180 degrees.

~ It's Given that,

            => Angle P = 140 degrees

             => Angle Q = Angle R

~ Solution;

       => Angle P + Angle Q + Angle R = 180 degrees

       => 140 + Angle Q + Angle R  = 180

       => Angle Q + Angle R  = 180 - 140

       => Angle Q + Angle R  = 40

       => Angle Q = 40/2

       => Angle Q = 20 degrees

~ Angle Q  = Angle R

~ 20 degrees = Angle R

therefore, as per theorem : opposite sides of equal angles are equal in a triangle. As, only two sides of the triangle are equal..This is an ISOCELES TRIANGLE.

HOPE, YOU FOUND IT USEFUL..THANK YOU :)