What is the mathematical name for that shape!

Trapezoid

Step-by-step explanation:

This is a quadrilateral with only one pair of parallel sides.

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"