Circle basics
Circumference
Area
Worded problems
General knowledge
100
What is the name of O indicated in the diagram?
Center
100
The circumference of a circle is the same as the P........?
Perimeter
100
What is the relationship between the radius of a circle and its area?
Area = pi x r2
100
A large barbeque chicken pizza from pizza hut has a radius of 10.5cm, what is the area of the pizza? (use pi as 22/7).
693cm2
100
Sitapatr school is located in which major province of Thailand?
Nahkon Si Thammarat
200
What is indicated by b in the diagram?
Diameter
200
What are the mathematical relationships between circumference and diameter and circumference and radius?
For bonus 100 baht what are the two values of pi we use in class?
Circumference = diameter x pi
and
Circumference = 2 x radius x pi
Bonus: pi = 3.14 and pi = 22/7
200
Taking pi as 3.14, find the area of a circle with radius 5cm?
78.50cm2
200
A bike wheel has a diameter 42cm. Taking pi as 3.14 find the circumference and the area of the bike wheel?
Circumference =65.94cm
Area = 1384.74cm
200
What is the name of the major shopping center located closest to Sitapatr school?
Central
300
What is the mathematical relationship between the diameter and radius of a circle?
Diameter = 2 times the radius
or
Radius = half the diameter
300
Taking pi as 3.14, find the circumference of a circle if its radius is 33.5cm.
For Bonus 50baht round the circumference to the nearest meter.
210.38cm
Bonus: 2m
300
Taking pi as 22/7, find the area of a circle with diameter of 7m?
38.5m2
300
A house has a circular floor with circumference of 314m.Using pi = 3.14, find the radius and diameter of the floor?
diameter = 100m
radius = 50m
300
What is the traditional name of the Thai shadow puppetry?
Nang Talung
400
If a circle has a diameter of 18.6428cm what is its radius?
9.3214cm
400
Taking pi as 22/7, find the circumference of a circle with a diameter of 17.5cm.
55cm
400
Circle A has a radius of 10cm, circle B has a diameter of 20.2cm, circle C has a circumference of 60.916cm and circle D has an area of 307.7514cm2. Which circle is the largest and which circle is the smallest? (use pi = 3.14).
Bonus 150baht: What is the difference between the diameter of the largest circle and the diameter of the smallest circle in mm?
Largest: Circle B
Smallest: Circle C
Bonus: 7mm
400
The surface of a circular lake has a circumference of 308m. Using pi = 22/7, find the diameter, radius and area of the surface of the lake?
Bonus 50 baht: State the area in kilometers and round to 1 decimal place.
diameter = 98m
radius = 49cm
area = 7546m2
Bonus: area = 7.5km2
400
What country was Teacher Tristram born in?
Australia
500
The radius of circle A is 9.62cm. The diameter of circle B is 19.18cm. Which circle is larger.
For bonus 100 baht: Calculate the difference in the size of the two circles in millimeters.
Circle A
Bonus
Circle A is 0.3mm bigger than circle B.
500
The radius of circle A is 0.5m. The diameter of circle B is 100.5cm. The circumference of circle C is 154cm. Which circle is the largest?
Circle B
500
A rectangle has a side length of 20mm and a width of 5mm. What is the circumference and area of the circle it was made from? (hint you first need to work out the radius). Use pi = 3.14.
Circumference = 31.4mm
Area = 78.5mm
500
While walking home from school Teacher Tristram found a strange 10-baht coin on the ground. The coin had the same diameter as a normal coin which is 2.6cm, however this coin had a square hole in the middle of it with a side length of 12mm. Using pi = 22/7, calculate the remaining surface area on both sides of the coin in square centimeters (use pi = 22/7).
Bonus 1000 baht: Calculate the volume of a normal 10-baht coin if the thickness is 2mm (state answer to nearest cubic mm).
area = 7.7322cm2
Bonus: volume = 10mm3
500
What is the name of the local soccer team in Nahkon si Thammarat?
Nahkon si United FC