This document is a worksheet for students on calculating the areas of trapezoids and rhombuses. It defines a trapezoid as a quadrilateral with one pair of parallel sides, and its area formula as A=1/2(b1+b2)h, where b1 and b2 are the two bases and h is the height. A rhombus is defined as a quadrilateral with four sides of equal length, and its area formulas are given as A=1/2d1d2 or A=d1d2, where d1 and d2 are the two diagonals. Students are provided examples and then asked to calculate the areas of sample trapezoids and
1. Name ____________________________________ Date __________________
Mrs. Labuski & Mrs. Portsmore Period _________ Unit 9 Lesson 4 Area of
Rhombus & Trapezoid
OC 6-2
VOCABULARY DEFINITION EXAMPLE
A=½(b1+b2)•h
Area of trapezoid A=½(6+4)•3
A= ½ (base1+base2)•height
A= ½(10)•3
A = (b1 + b2)•h
A= 5•3
2
(or) A = ½(b1 + b2)•h
A=15 in2
Area of rhombus
A = ½d1d2
(or) A = d1 • d2
AREA
2
A = ½d1d2
A=½•6•8
A = ½ • 48
A = 24 cm2
Area of rhombus
(a rhombus is also a A = bh
parallelogram so the A = 12•21
formula for that figure A = 252 in2
is A = bh)
2. Now you try:
Find the area of the trapezoid.
A=½(b1+b2)•h A=½(b1+b2)•h
A=½(3+7)•4 A=½(8+6)•5
A= ½(10)•4 A= ½(14)•5
A= 5•4 A= 7•5
A=20 in2 A= 35 in2
Find the area of the rhombus.
A=½d1d2 A=bh
A=½•12•15 A=8•5
A= 6•15 A= 40 cm2
A= 90ft2
3. Name ____________________________________ Date __________________
Mrs. Labuski & Mrs. Portsmore Period _________ Unit 9 Lesson 4 Area of
Rhombus & Trapezoid
OC 6-2
VOCABULARY DEFINITION EXAMPLE
AREA
Area of trapezoid
Area of rhombus
4. Area of rhombus
(a rhombus is also a
______________ so the
formula for that figure
is A = ________)
Now you try:
Find the area of the trapezoid.
A=½(b1+b2)•h A=
A= A=
A= A=
A= A=
A= A=
Find the area of the rhombus.
A= A=
