Area of Parallelograms
Find the area of a parallelogram with a base of 18 and a height of 35.
630
Find the area of a triangle with a base of 2 and a height of 5.
5
If the side lengths are doubled, what number would you multiply the side lengths by?
2
How do you use coordinates to find the length of polygons?
Subtract x and y coordinates to find lengths.
4.
145
Find the area of a parallelogram with a base of 8.8 and a height of 10.4.
91.52
Find the missing dimension. Height of triangle is 12 and area is 24.
4
If the side lengths of a rectangle are tripled, what effect would this have on the perimeter?
The perimeter would be 3 times bigger.
In the x coordinates are the same, what do you do to find the length of the polygon on the coordinate plane?
Subtract the y coordinates.
Skills Practice 4.
55.5
Find the area of a parallelogram with a base of 12.75 and a height of 5.4.
68.85
Find the area of a trapezoid with a base one of 0.4, a base two of 0.9, and a height of 0.8.
0.5
Suppose the side lengths of a rectangle with a length of 6 and a width of 4 are doubled. What effect would this have on the perimeter?
The perimeter would be two times greater. Original: 20. New: 40.
A rectangle has vertices A(1,1), B(1,3), C(5,3), and D(5,1). Use the coordinates to find the length of each side. Then find the perimeter of the rectangle
Width: Find the length of the horizontal lines. −−− AD is 4 units long. −−− BC is 4 units long. Length: Find the length of the vertical lines. −−AB is 2 units long. −−− DC is 2 units long. Add the lengths of each side to find the perimeter. 4 + 4 + 2 + 2 = 12 units So, rectangle ABCD has a perimeter of 12 units.
Reteach 3.
120
Find the height of a parallelogram if its base is 9 feet and its area is 27 feet.
3
Find the area of a trapezoid with a base one of 7, a base two of 14, and a height of 5.
52.5
If the length 6 and width 4 of a rectangle are doubled, what effect would this have on the area?
The new area is 4 times longer. Original area: 24. New area: 96
Use the coordinates to find the lengths of the rectangle. Then find the perimeter. R(1,1), S(1,7), T(5,7), U(5,1)
20
Reteach 2.
15
Find the area of a parallelogram with an area of 41 square meters and a base of 8.2 meters.
5
Find the height of a trapezoid with an area of 105, base one of 9 and base two of 12.
10
Each side length of a triangle with measurements 3, 4, and 5 are tripled, what effect would this have on the perimeter?
The perimeter would be 3 times bigger.
Use the coordinates to find the lengths of the rectangle. Then find the perimeter. E(3,6), F(7,6), G(7,2), H(3,2)
16
Reteach 1.
65