Lesson 22 Instructional Book pg. 220-223

What is the distance from the center to the rim of the fountain?

What type of triangle is the window frame?

How do you know?

What is the diameter, d, of the table?

Which triangle is a right triangle?

• Triangle J

• Triangle K

• Triangle L

• Triangle M

Lian chose A as the correct answer. How did he get that answer?

Tell whether each sentence is true or false:

Groups:

(a) True

,

(b) False

• The diameter of a circle is longer than its radius.

• Knowing the measure of 1 angle is always enough to identify an acute, obtuse or right triangle.

• Any radius on the same circle will extend from the center of the circle.

• An obtuse triangle has one angle that measures 90 degrees or more.

Which group of angle measures describes an acute triangle? Select all that apply.

What is the radius, r, of Jelani's circle?

Label each triangle. Is it an obtuse triangle or a right triangle?

b

c

d

a

Acute triangle

Right triangle

Obtuse triangle

Right triangle