Shapes Flashcards
Area for a trapezium
(a+b)/2xh
Circumference of circle
Pi x d
Area of circle
Pi x r^2
Sector of circle perimeter
Angle / 360 x (2 pi x r)
Area of sector of circle
Angle / 360 x (pi x r^2)
Circle arc length
L = angle/360 x (2 pi x r)
Surface area for cylinder
2 pi x r x (r x h)
Cable volume and surface area
a^3 and 6 x a^2
Cuboid volume
L x W x H
Cuboid surface area
2 (lw + wh + hl)
Volume for a cone
1/3 x pi x r^2 x h
Surface area for cone
Pi x r x l + pi x r^2
Sphere volume
4/3 x pi x r^3
Sphere surface area
4 pi x r^2
Isosceles triangle means
Two equal sides
Scalene triangle means
No equal sides
Obtuse triangle means
Larger than 90 degree angle but less than 180
Acute triangle means
Less than 90 degree angle
Reflex angle
Larger than 180 but less than 360 degrees
Complimentary angle
Adds to 90 degrees
Supplementary angle
Adds to 180 degrees
What is meant by similar triangle
A similar triangle is proportional to the other. Same angles
What do all the exterior angles of a regular polygon add up to?
360
What is an exterior angle?
Supplementary to interior angle (180)
