Mrs.D Math · 7th Grade

ORBIT

Introduction to Circles
C = π × d
C = 2 × π × r
⚫ Parts of a Circle
◯ Circumference
🎲 Mixed
⚫ Parts of a Circle
◯ Circumference
🎲 Mixed
📺 Mrs.D Math Lesson
Watch on YouTube
Watch on YouTube ↗
Made for Mrs.D Math students 🎉
⚫ Introduction to Circles

Parts of a Circle

●
Center — the fixed middle point of the circle
Every point on the circle is the same distance from the center.
r
Radius — the distance from the center to any point on the circle
Diameter = 2 × radius
d
Diameter — a chord that passes through the center; the longest distance across
Radius = diameter ÷ 2
C
Circumference — the distance all the way around the circle
Like perimeter, but for circles!

Circumference Formulas

πd
C = π × d — use when given the diameter
d = 10 → C = π × 10 = 10π
2πr
C = 2 × π × r — use when given the radius
r = 4 → C = 2 × π × 4 = 8π
π
Leave your answer in terms of π — write the number times π (no calculator needed!)
Answer as “10π” not “31.4”
Score
0
Streak ⚡
0
Lives
❤️❤️❤️
Easy
QUESTION 1 / 10
PARTS OF A CIRCLE
📺 Mrs.D Math Lesson
Watch on YouTube
Watch on YouTube ↗
◯
Easy Level
ORBIT COMPLETE!
Great work!

Your Results

0
points
0
Correct
0
Wrong
0
Best Streak
📋 Answer Review
Easy Level
All questions