Answer all of it please.?

2020-04-08 12:02 am

回答 (2)

2020-04-08 12:22 am
1)
Area
= 20² + (1/2) × (20 + 9 + 9) × 30 in²
= 970 in²

2)
Area
= 30 × 18 + 18² cm²
= 864 cm²

3)
Area
= 4² + (1/2) × 4 × 2 cm²
= 20 cm²

4)
Area
= 48 × 12 + 24² yd²
= 1152 yd²

5)
Area
= 18 × 10 - (1/2) × 10 × 8 yd²
= 140 yd²

6)
Area
= 18 × 14 + (1/2) × 18 × 9 m²
= 333 m²

7.)
Area
= 17 × 16 + 14² ft²
= 468 ft²

8)
Area
= 8 × 4 + 4² in²
= 48 in²

9)
Area
= (1/2) × (10 + 5) × 10 ft²
= 75 ft²
2020-04-08 12:27 am
Seriously?  No.  But (if you are not a troll) see if this helps.

Each shape can all be split into either:
- 2 rectangles or
- a triangle plus a rectangle.

Area of a triangle = ½ * base * height
Area of a rectangle = length * width
_________________________

For example first shape can be be split into:

triangle: base =  9in. + 20in. + 9in. = 38in.; height = 30in.
area =  ½ * 38 * 30 = 570 sq.in.

rectangle: length = 20in.; width = 20in. (i.e. a square)
area = 20 * 20 = 400 sq. in.

Total area = 570 + 400 = 970 sq. in.

Once you understand that, the rest should be easy for you to do for yourself.


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