26. Four mark exercise problems VIII

1. In triangle \(ABC\), the measure of \(\angle B\) is two-third of the measure of \(\angle A\). The measure of \(\angle C\) is \(20^{\circ}\) more than the measure of \(\angle A\). Find the measures of the three angles.

 

Answer:

 

 

2. Two equal sides of an isosceles triangle are \(5y - 2\) and \(4y + 9\) units. The third side is \(2y + 5\) units. Find '\(y\)' and the perimeter of the triangle.

 

Answer:

 

\(y =\)  units

 

Perimeter of the triangle \(=\)  units