Bell Ringer – February 2^nd

• Write an inequality to represent each situation.
• Josh ran at least 10 miles.

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• Mary baked no more than 5 pies.

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• The basketball team won by less than 2 points.

r ≥ 10

p ≤ 5

x < 2

Domain 3 Test

• When you are finished with the test, work on the Bonus Plotting Points worksheet.

Lesson 27

Finding the Area of Triangles and Quadrilaterals

Bell Ringer – February 3^rd

• Write an algebraic expression for each verbal expression. Let n = the number.
• 15 more than a number
• 20 decreased by a number
• The quotient of 10 and a number.
• The product of 3 and a number.
• 4 multiplied by the sum of a number and 5

15 + n

20 – n

10 ÷ n

3n

4(n + 5)

Vocabulary

• Quadrilateral – a polygon with 4 sides

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• Parallelogram – a quadrilateral and both pairs of opposite sides are parallel

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• Triangle – a polygon with 3 sides

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• Right triangle – a triangle with a right angle

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Area

• The number of square units in the interior of a figure.

4 units

6 units

Area = 24 square units

Area of a Parallelogram

A = bh

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3 cm

5 cm

4 in

7 in

15 cm²

28 in²

Area of a Triangle

A = ½ bh

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4 in

3 in

5 cm

4 cm

A = ½ (4)(3)

A = 2(3)

A = 6 in²

A = ½ (4)(5)

A = 2(5)

A = 10 cm²

Homework

• Worksheet #66

Bell Ringer – February 4^th

• Find the area of each shape below.

a. b.

7 cm

5 cm

6 cm

4 in

8 in

5 in

A = ½ (5)(6)

A = ½ (30)

A = 15 cm²

A = (4)(8)

A = 32 in²

Find the area of the trapezoid

4 yd

5 yd

8 yd

6 yd

Area₁ = ½ (4)(5)

Area₁ = 10 yd²

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Area₂ = (8)(5)

Area₂ = 40 yd²

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Area₃ = ½ (6)(5)

Area₃ = 15 yd²

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Total Area = 10 + 15 + 40

Total Area = 65 yd²

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1

2

3

Find the total area of the garden below

14 ft

12 ft

10 ft

Area of parallelogram

A = bh

A = (14)(12)

A = 168 ft²

Area of triangle

A = ½ bh

A = ½ (14)(10)

A = 70 ft²

Total Area = 168 + 70

Total Area = 238 ft²

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Homework

• Worksheet #67