LA5 marksYear: 2025MediumCBSE Class 10
quadratic-equationsheron-formulaisosceles-triangle
Question
The perimeter of an isosceles triangle is 32 cm. If each equal side is 65 of the base, find the area of the triangle.
Solution
1
Let each equal side of triangle be x and base be y.
ATQ, x+x+y=32
Also, x=65y
+1 mark2
2x+y=32⇒2×65y+y=32⇒610y+6y=32
+1 mark3
On solving these equations, we get x=10 and y=12.
∴ sides of the triangle are 10 cm, 10 cm, 12 cm.
+0.5 marks4
Semi-perimeter =16 cm.
Area of the triangle =16×6×6×4 +1.5 marks