Challenge!
What is the value of pi?
3.14
If the diameter of a circle is 4mm, what is the radius?
2mm
what is the formula for the circumference of a circle?
pi x d
or
2 x pi x r
What is the formula for area of a parallelogram?
base x height
If the radius of a circle is 14m, what is the diameter?
28m
what does it mean to square something?
e.g. 5 squared
it means you multiply it by itself
e.g., 5 x 5 = 25
If the diameter of a circle is 26cm, what is the radius?
13cm
If the diameter of a circle is 2.5m, what is the circumference?
2.5 x 3.14
=7.85m
What is the formula for area of a triangle?
(base x height) divided by 2
or
half (base x height)
If the radius of a circle is 3km, what is the diameter?
6km
What does CONGRUENT TRIANGLES mean?
SAME TRIANGLES - same length of sides, same area, same angle measurements
Explain what a radius is.
A radius is the measurement from the center of a circle to any point on the circumference.
If the radius of a circle is 5cm, what is the circumference?
2 x 3.14 x 5
=31.4cm
What is the formula for area of a circle?
pi x r squared
Explain what a diameter is.
A diameter is the measurement from one point on the circumference to another point on the circumference, through the center.
Which of these is NOT a type of triangle:
isosceles
equilatereral
parallel
scalene
parallel
Is it possible for a circle to have 40 radii?
yes
Define what circumference means.
The measurement around the outside of a circle
or
the perimeter of a circle
The area of a rectangle is 24cm squared. The base is 6cm. What is the height?
4cm
Is it possible to have 25 diameters in one circle?
yes
I want to build a circular pool in my rectangular yard, which measures 4m x 5m.
True or false: the radius of the pool can be 2.5m.
False. the maximum radius possible is 2m
Can a square have a radius?
No
The circumference of a circle is 15cm. The diameter is 7cm. Is this possible? Why or Why not?
Not possible. If the diameter is 7cm, and
C = pi x d
C = (3.14)(7)
C must = 21.98cm NOT 15cm
The area of a triangle is 24.5mm.
The height is 7mm.
What is the base?
7mm
If a circle has three different diameters drawn, would they be the same length or different lengths?
same