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A) 283.4mm^2

Step-by-step explanation:

Ok area of a circle

A=πr2

Radius is half of diameter

19/2=9.5

so

A=(3.14)9.5^2

A=283.385

round this nearest tenth

283.4mm^2

area of semi circle=1/2 ×π(19/2)²=1/2 ×3.14×19²/4=1133.54/8=141.6925=151.7mm²

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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