Question

using herons formula calculate the area and the altitude of an equilateral triangle of side 80 cm.

Answer 1

Sides of equilateral triangle = 80cm

Area of EQUILATERAL triangle = ✓3/4a²

= ✓3/4 × (80)² = ✓3 / 4 × 6400 = ✓3× 1600 = 1600✓3 cm²

Perimeter of equilateral triangle = 3a = 3×80 = 240 cm

Answer 2

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