25-13 = 12 which is the sum of the two bases at the ends
h is the height
area of rectangle in the middle = 13 h
x is base of one triangle (below the 10) so 12-x is the other(below the 15
(12-x)^2 + h^2 = 225
x^2+h^2 = 100
---------------------subtract
144-24x = 125
x = 19/24
etc
get x and h then area of the two end triangles, add to your 13 h
The parallel sides of a trapezium are 25 cm and 13 cm.its non parallel sides are 15 cm and 10 cm. Find the area of the trapezium.
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