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The parallel sides of a trapezium are 20...

The parallel sides of a trapezium are 20 cm and 10 cm and its non-parallel sides are equal to each other. If its area is 180 `cm^2` , then what is the length (in cm) of each non parallel side? /
एक समलंब चतुर्भुज की समानांतर भुजाएं 20 सेमी तथा 10 सेमी की हैं तथा इसकी गैर-समानांतर भुजाएं एक दूसरे के बराबर हैं | यदि इसका क्षेत्रफल 180 वर्ग सेमी है, तो प्रत्येक गैर-समानांतर भुजा की लंबाई ज्ञात करें |

A

11

B

13

C

12

D

15

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