a cow is tied with arope of length 7cm at the corner of a triangular field with each side 15cm if the length of the rope is increased by 4.5 m, find increase in area of the field in which the cow can graze
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Answer:
Area of the field in which the cow can graze
= πr²/4
= π(14)²/4
= 196π/4
= 49π
= 49 ×22/7
= 154 m²
Area of rectangular field
= l × b
= 20 × 15
= 300 m²
Area of the field in which the cow cannot graze
= Area of rectangular field - Area of the field in which the cow can graze
= 300 m² - 154 m²
= 146 m².
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