Question

If the altitude of an equilateral triangle is 5cm, then it's area equal to

Answer 1

Step-by-step explanation:

Given;

Altitude = 5cm.

∆ ABC is an equilateral triangle.

ATQ:

h= √3/2a

= 5= √3/2a

= √3a= 10

= a= 10/√3.

and, area = √3/4a²

= √ 3 /4×10/√3= √3×√3/4×10

= 3/ 40cm²(ans)...

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