Question

* Calcul
Find the perimeter and area of an equilateral triangle whose height is 12 cm. Write your answers, correct to decimal places.
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Answer 1

Answer:

10.38

Step-by-step explanation:

Answer 2

Step-by-step explanation:

height in a equilateral triangle =( root3× a /2 ), where a is side

given height = 12cm

=> 12 =( root 3 a / 2 )

24 = root3 ×a

a = 8 × root3

perimeter of equilateral triangle = 3× a = 3 × 8× root3

= 24×root3 = 41.56cm

area of an equilateral triangle = root3(a^2)/4

= root3 ×64×3 / 4 = 83.138 cm^2