circle and circumference
What is π
3.14 and 22/7
A car travels 150 km in 3 hours.
What is its speed?
Speed = Distance ÷ Time
= 150 ÷ 3
= 50 km/hour
The speed of a bicycle is 85.7 kph. How far will it travel in 12 minutes?
1050 kph
A car travels 150 km at 75 km/hour.
How much time does it take?
Time = Distance ÷ Speed
= 150 ÷ 75
= 2 hours
The radius of a circle is 7 cm.
Find the area. (Use π = 22/7)
Area = π × r²
= 22/7 × 7 × 7
= 154 cm² Area = π × r²
= 22/7 × 7 × 7
= 154 cm²
If the radius is 7, what is the diameter?
14
Question:
A car travels 120 km in 2 hours.
What is its speed?
Speed = Distance ÷ Time
Speed = 120 ÷ 2 = 60 km/hour
A bus moves at 70 km/hour for 4 hours.
Find the distance.
Distance = Speed × Time
= 70 × 4
= 280 km
A runner covers 600 meters at 300 m/min.
Find the time.
Time = 600 ÷ 300
= 2 minutes
A car travels 180 km in 3 hours.
What is the speed?
Speed = Distance ÷ Time
= 180 ÷ 3
= 60 km/hour
The radius of a circle is 10 cm.
Find the area.
(Use π = 3.14)
Area = π × r²
= 3.14 × 10 × 10
= 314 cm²
A runner covers 600 meters in 4 minutes.
Find the speed.
Speed = Distance ÷ Time
= 600 ÷ 4
= 150 m/min
A bus moves at 60 km/hour for 3 hours.
Find the distance.
Distance = Speed × Time
= 60 × 3
= 180 km
A plane flies 800 km at 400 km/hour.
Find the time.
Time = 800 ÷ 400
= 2 hours
A runner covers 900 meters in 6 minutes.
Find the speed.
Speed = 900 ÷ 6
= 150 m/min
The radius of a circle is 7 cm.
Find the circumference.
(Use π = 22/7)
Circumference = 2 × π × r
= 2 ×(22/7) × 7
= 44 cm
your team is tough!!
bonus
A cyclist rides at 20 km/hour for 5 hours.
What distance does he travel?
Distance = 20 × 5 = 100 km
A bike travels 45 km at 15 km/hour.
How long does it take?
Time = 45 ÷ 15
= 3 hours
A train travels 240 km at 60 km/hour.
How much time does it take?
Time = Distance ÷ Speed
= 240 ÷ 60
= 4 hours
The radius of a disk is 14 cm.
Find the area.
(Use π = 22/7)
Area = π × r²
= (22/7) × 14 × 14
= 616 cm²
A bike travels 90 km in 1.5 hours.
What is the speed?
Speed = 90 ÷ 1.5
= 60 km/hour
A train travels at 90 km/hour for 2 hours.
Find the distance.
Distance = 90 × 2 = 180 km
A train travels 300 km at 100 km/hour.
Find the time.
Time = Distance ÷ Speed
= 300 ÷ 100
= 3 hours
A bus moves at 80 km/hour for 5 hours.
Find the distance.
Distance = Speed × Time
= 80 × 5
= 400 km