Math, asked by tarun137, 1 year ago

two adjacent side of a parallelogram are of length 5 cm and 7 cm and the diagonal connecting the end of this side of length 9cm find area of parallelogram

Answers

Answered by BeUnknown

Put Heron's formula to get the area of one half of the parallelogram. Semiperimeter equals (5+7+9)/2 = 21/2 cm. Let a = 5, b = 7, c =9. s-a = 11/2, s-b = 7/2, s-c = 3/2. As per the formula, area of the triangle = sqrt{s(s-a)(s-b)(s-c)} = 21sqrt(11)/2 for one half. So the total area equals 21sqrt(11) cm^2.

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tarun137: answer not matching

BeUnknown: Where did you get your answer from?

tarun137: show

BeUnknown: I'm sure mine is correct. Have a look yourself! I don't want to be offensive but your source seems irrelevant.

BeUnknown: Why did you report me btw?

BeUnknown: Sorry the answer is wrong. I missed out a two during the calculation of the triangle. The total answer is half of the one I originally proposed.

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