Circumference
What is the circumference formula?
C = 3.14 x d
or
C = 3.14 x r x 2
What is the area of a circle formula?
A = 3.14 x r2
___-___< x < ___+___
What is an acute angle?
What is a right angle?
What is an obtuse angle?
Right: Exactly 90o
Abtuse: Over 90o
If a circle has a diameter of 5 in, what is the circumference of the circle.
15.7 in
If the radius of a circle is 9 in, what is the area of the circle?
254.34 in2
Do these 3 triangle sides make a triangle?
Side A: 12 in
Side B: 7 in
Side C: 14 in
Yes
Given the characteristics, how many triangles are possible:
A triangle with angle measures of 30o, 70o, 80o.
Many trianlges
A circle has a radius of 12 cm. What is the circumference of the circle?
75.36 cm
314 meters2
Do these 3 side lengths make a triangle?
Side A: 8 cm
Side B: 2 cm
Side C: 11 cm
No
How many triangles can be constructed with three angles, each measuring 63o?
None
A circle has a circumference of 47.1 cm. Using 3.14 for pi, what is the circles' diameter.
15 cm
If a circle has a radius of 5.2 cm. What is the area of the circle?
84.9 cm2
What is the range for a third side of a triangle if one side is 22 in and the other side is 14 in?
8< X < 36
Given the characteristics, how many triangles are possible?
-Two sides are 12 in long.
-At least one angle measures 30o
2 or more
The penguin exhibit at a zoo has a raised circular island that is surrounded by water. The diameter of the island is 20 meters. One penguin swims half way around the island before hopping out.
How far did the penguin swim?
31.4 meters
Alice has two flying disks. One is 12 cm in diameter and the other is 24 cm in diameter. What is the difference between the areas of the two flying disks?
452.16 - 113.04 = 339.12 cm2
What is the range that the third side could be if one side is 15.48 m and the other side is 37.67m?
22.19 < X < 53.15
Given the characteristics, how many triangles are possible?
-One side is 10 cm long
-One side is 4 cm long
-One angle measures 100o
2 or more.