the perimeter of a rectangle is 68m and length of its diagonal is 26m.find area
gaurav , 9 Years ago
Grade 9
Analytical Geometry> the perimeter of a rectangle is 68m and l...
2 Answers
Vijay Mukati
Last Activity: 9 Years ago
Dear student
Hint: P = 2(L+B), D2= L2 + W2, A = LW, To find LW use (L+W)2= L2 + W2 + 2LW.
Thanks
A M S ARUN KRISHNA
Last Activity: 9 Years ago
P = 2(l + b)
68 = 2(l + b)
l + b = 34
d = 26
(l + b)2 = 342
l2 + b2 + 2lb = 1156
l2 + b2 = d2 (pythagoraus theorem)
l2 + b2 = 262 = 676
676 + 2lb = 1156
2lb = 480
lb = 240
area = 240m2
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