Shaded area is;
Area trapezoid with parallel sides 58 cm and 28 cm, and height 30 cm - Area trapezoid with parallel sides 9 cm and 30 cm, and height 28 cm - Area triangle with height 12 cm and base 12 cm.
= ½*30(28+58) - ½*28(9+30) - ½*12*12
= (15*86) - (14*39) - 72
= 1290 - 546 - 72
= 1290 - 618
= 672 cm²
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