Hard Math Class 9 Level 1

A rhombus has perimeter 100 cm and one diagonal 14 cm. What is half of the other diagonal?

समचतुर्भुज का परिमाप 100 cm है और एक विकर्ण 14 cm है। दूसरी विकर्ण की आधी लंबाई क्या होगी?

A 12 cm / 12 cm B 24 cm / 24 cm C 48 cm / 48 cm D 50 cm / 50 cm
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Correct Answer

B. 24 cm / 24 cm

Explanation

The side is 25 cm. The half diagonals 7 and d/2 form a right triangle so d/2 = √(25² - 7²) = 24.

भुजा 25 cm है। विकर्ण आधे 7 और d/2 लंबवत त्रिभुज बनाते हैं इसलिए d/2 = √(25² - 7²) = 24।

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What is the area of a circle with radius 7 cm when π = 22/7?

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