Question

Find the area of an equilateral triangle of side (i)4cm and (ii)5cm and (iii)7cm correct to two places of decimal.(use √3=1.732.)

Answer 1

Answer:

Step-by-step explanation:

WE KNOW AREA OF EQU. TRIANGLE = A²*√3/4

FOR A = 4

AREA = √3/4 * 4²

⇒√3*4

⇒1.732*4

⇒6.98 CM²

FOR A = 5

AREA = √3/4 * 5²

⇒√3/4 * 25

⇒√3 * 6.25

⇒1.732 * 5.25

⇒10.82

FOR A =7

AREA = 49/4 * 1.732

⇒12.25 * 1.732

⇒21.21