Areas of Quadrilaterals
and Triangles
by David Pleacher
Fill in the following area formulas:
1. Area of Square = ________
2. Area of Rectangle = ________
3. Area of Triangle = ________
4. Area of Trapezoid = ________
5. Area of Parallelogram = ________
6. Area of Rhombus = b h where b = base and h = altitude
Area of Rhombus = 1/2 d1 d2 where
d1 and d2 are diagonals
Cross Number Puzzle
Across
a. The diagonals of a rhombus are 15 cm and 20 cm, what is its area?
b. If the area of a rhombus is 250 in2 and an altitude is 50 in, what is the length of each side?
c. Determine the area of a triangle whose base is 13 m and altitude is
8 m.
d. Determine the area of a parallelogram with base 
ft and altitude
ft.
f. Determine the area of a square whose side is 
inches.
Down
a. In parallelogram ABCD, AB = 
cm, AD =
cm, and 
.
Determine the area of parallelogram ABCD.
b. Determine the area of the rectangle whose dimensions are 
.
d. The diagonals of a rhombus are 
. Determine its area.
e. The area of a rhombus is 348 square inches and one diagonal has length equal to
24 inches. Determine the length of the other diagonal.