Mensuration/ Geometry Flashcards
Area of a rectangle
length * base
Area of a trapezium
1/2(a+b)h
Area of a triangle
1/2 (base * height)
Area of a parallelogram
A = base * height
Circumference of a circle
π * diameter
Area of a circle
π * r²
Diameter of a circle
2 * radius
Area of a sector (of a circle (like a slice))
a/360 * πr²
Lenght of an arc
a/360 * πD
Cylinder, Surface Area
Curved Surface Area
π * 2r * h
Total Surface Area
(π * 2r * h) + (2 * π * r²)
Sector
Area in a circle enclosed by two radii
eg. a pie slice.
Segment
An area of a circle enclosed by a chord and an arc.
(As if someones sliced off the edge of a pie)
(work out area by working out the triangle of the sector and minusing)
Arc
Segment of the circumference of a circle
Two angles opposite each other in an ‘x’
Vertically opposite
Two angles on same side of line intersecting a parallel pair of lines. (forms an ‘F’ shape)
Corresponding angles
