What is the area of 42•••
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Sia ? 6 years ago
a = 18 cm, b = 10 cm.
= 21 cm
= 21
cm2
Perimeter = 42 cm.
⇒ a + b + c = 42
∴ 18 + 10 + c = 42
∴ 28 + c = 42
∴ c = 42 – 28
∴ c = 14 cm.
s =
∴ Area of the triangle =
=
=
= (7)(3)
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