Find the area of an equilateral triangle whose each side is 30 cm. By Pythagoras therom.
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altitude of the triangle = √side ^2 - (side/2) ^2
√ ( 30 cm) ^2 - ( 15 cm ) ^2
= √ ( 9,00 cm ^2 - 225 cm ^2 )
= √( 675 cm ^2)
= 15 √ 3 cm.
area of triangle = 1/2 × base × height
= 1/2 × 30 × 15 √ 3 square cm
=225 √ 3 square cm.
√ ( 30 cm) ^2 - ( 15 cm ) ^2
= √ ( 9,00 cm ^2 - 225 cm ^2 )
= √( 675 cm ^2)
= 15 √ 3 cm.
area of triangle = 1/2 × base × height
= 1/2 × 30 × 15 √ 3 square cm
=225 √ 3 square cm.
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0
Answer:
225√3cm square
Step-by-step explanation:
√3/4(side) square
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