Areas Of Irregular Shapes Worksheet Page 3
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11Lesson 12
W
R
e
e m e m b e r
Check using digit sums. Put an x after each wrong product.
2. a.
b.
3 1 4
7 3 2
× 5 7
× 1 6 7
2 1 9 8
5 1 2 4
1 6 1 0 0
4 3 9 2 0
1 8,2 9 8
7 3 2 0 0
1 2 2,2 4 4
$
If a product in either problem above is wrong, check each partial product and x the wrong ones.
Use the formula to find the area of each parallelogram.
18 m
6 yd
14 yd
8 m
3. a.
b.
Combine integers.
4. a. –15 + (–6) =
b. –8 + (–9) =
c. 9 + (–8) =
5. a. 6 + 10 =
b. –10 + 19 =
c. –9 + 11 =
M
D
a s t e r y
r i l l
6. The formula for finding the area of a rectangle is
.
7. The formula for finding the area of a trapezoid is
.
8. The formula for finding the circumference of a circle is
.
9. a. A quadrilateral has
sides.
b. 1 yard
=
feet
3
3
10. a. The fraction we use for π is
.
b. The decimal we use for π is
.
49
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