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find area of an equilateral triangle whose side is 5 cm

Posted by Krishna Goel 8 years, 6 months ago

CBSE > Class 09 > Mathematics

2 answers

Hans Raj 8 years, 6 months ago

s=5+5+5/2=15/2=7.5

area = root 7.5(7.5-5)(7.5-5)(7.5-5)

= root 7.5x2.5x2.5x2.5

= 2.5 x 2.5 root 3

= 6.25 {tex}\sqrt{3}{/tex} cm²

0Thank You

Agni Roy 8 years, 6 months ago

Area of an equilateral triangle={tex}√ 3 /2\times (side)^2 {/tex}=1.732/2 x (5x5)=21.65cm²

1Thank You

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CBSE > Class 09 > Mathematics