NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 6: Triangles - Problems and SolutionsQuestion 121
Class 7 - Mathematics - Unit 6: Triangles - Problems and Solutions
Question. 121
Each of the two equal angles of an isosceles triangle is four times the third angle. Find the angles of the triangle.
Answer:
20°, 80°, 80°
Detailed Answer with Explanation:
Let base angle = x. Then third = x/4. So 2x + x/4 = 180 ⇒ 9x/4 = 180 ⇒ x = 80. Third = 20°.