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Mensuration Practice Test 4
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© examsnet.com
Question : 34
Total: 40
The base of an isosceles triangle measures 224 cm and its area is 192 cm. Find its perimeter.
64 cm
20 cm
24 cm
16 cm
Validate
Solution:
Area of the isosceles triangle = 192 cm
Area =
b
4
√
4
a
2
−
b
2
192 =
24
4
√
4
a
2
−
(
24
)
2
192 =
6
√
4
a
2
−
576
192
6
=
√
4
a
2
−
576
32 =
√
4
a
2
−
576
1,024 =
4
a
2
− 576
1,600 =
4
a
2
a
2
= 400
a = 20 cm.
Perimeter of the triangle = 2a + b = 2 (20) + 24
= 40 + 24
= 64 cm.
© examsnet.com
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