Answer:
Working and Solution for Each Answer Provided Below
Explanation:
1)The trapezium is a rectangle's area+ a triangles
Rectangle-L=9cm
W=6cm
Triangle-H=6cm
W=15-9=6cm
Therefore 6×9+6×6÷2=72cm squared
2)The next one is the same but with 2 triangles and therefore I won't do all the working like the previous question.
=Rectangle+Triangle+Triangle
=50×32+20×32÷2+20×32÷2
=2,240m squared
3)7×20+9×20÷2
=140+90
=230cm squared
4)4×3+3×4÷2+1×4÷2
=20 units squared
5)a)3×3=9 units squared
b)1×3÷2=1.5 units squared
c)3×3+3×1÷2+3×1÷2=12 units squared
6)a)2×6=12cm squared
b)6×2=12-They are equal in size and therefore divide by 4
=3 units squared
7)2 triangles=3×2=6 units squared ×2 (for 4 triangles)=12 units squared
8)base of a triangle=(8-6)÷2=1 (for extra marks you can state that this triangle should be impossible due to the Pythagorean theorem)
area=4+4+24=32cm squared
9)area=9×6+6×6+5×6=120 cm squared
10)4 triangles / 2 triangles=3×3=9
4 triangles=18 units squared