1.

The base and hypotenuse of a right triangle are respectively 5 cm and 13 cm long. Its area is A. 25 cm2 B. 28 cm2 C. 30 cm2 D. 40 cm2

Answer»

Using Pythagorous theorem:

(Hypothesis)2 = (Base)2 + (Altitude)2

(13)2 = 52 + (Altitude)2 

(Altitude)2 = 169 – 25 = 144 

Altitude = 12 cm 

Area of triangle = \(\frac{1}2\)(5 x 12)

= 30 cm2



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