Section 7-4: Area of Trapezoids, Rhombuses and Kites

March 27, 2012

Warm-up (H): (15 mins)

Practice Book: Practice 7-3 # 1 – 16

Warm-up (R): (15 mins)

Practice Book: Practice 7-3 # 1 – 11, 14, 16

Warm-up

Warm-up

Questions on Homework?

Section 7-4: Area of Trapezoids, Rhombuses, and Kites

Objective: Today you will learn to find areas of trapezoids, rhombuses, and kites.

Area of a Trapezoid

Area of a TrapezoidA = ½ h(b1 + b2)

Height of a trapezoid is the perpendicular distance between the bases.

Example 1: Find area of Trapezoid

Example 2: Find area of Trapezoids

Example 3: Find area of Trapezoid

Area of a Rhombus or Kite

Area of a Rhombus or a Kite A = ½(d1*d2)

Example 4: Find area of Kite

Example 5: Find area of Rhombus

Example 6: Find area of Kite

Example 7: Find area of Rhombus

Example 8: Find area of Kite (to nearest hundredth)

B2 – Catch up from yesterday

Example 2: Find all sides of this triangle and then find the area – leave answer in simplest radical form.

B2 – Catch up from yesterday

Example 3: If a square has one side length of 5, what is the length of its diagonal?

Example 4: Find the angles and area of a rectangle with a diagonal of 6m and one side length of 3m. Round to nearest tenth.

B2 – Catch up from yesterday Softball Field Examples

On a high school softball field, the distance between bases is 60 ft.

1. To the nearest foot, how far does a catcher have to throw the ball from home to 2nd base? Round to nearest hundredth.

2. What is the perimeter of the softball field?

3. What is the area of the softball field?

Wrap-up Today you learned to find areas of trapezoids,

rhombuses, and kites. Tomorrow you’ll learn to find area of regular

polygons

Quiz on Sections 7-1 to 7-3 on Thursday!Homework (H) p. 376 – 377, #1-20, 22, 29-31, 34-36

Wrap-up Today you learned to find areas of trapezoids,

rhombuses, and kites. Tomorrow you’ll learn to find area of regular

polygons

Quiz on Sections 7-1 to 7-3 on Thursday!Homework (R) p. 376 – 377, #1-20, 22, 29, 31, 36