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The first volume of the fifth grade math exercise book, 56 pages, has seven questions, and the answers are all urgent, urgent, urgent and urgent.
The shaded part is a triangle, and the area of the triangle is the bottom x height /2.

This triangle can be regarded as the base of a trapezoid, that is, the length is 10cm.

At this time, the height of the triangle is the height of the trapezoid. If it is set to h, then 10Xh/2=70. H =14cm

The area of the trapezoid is (10+18) x14/2 = 28x7 =196 cm2.

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