Geometry week 1 Flashcards
What kind of triangles can the pythagorean theorem be used with?
Right angle triangles only
Define right angle:
An angle of 90°.
Can be found in the corner of a square or at the intersection of two perpendicular straight lines
Define acute angle:
Any angle that measures less than 90 degrees.
Define obtuse angle:
A type of angle that is always larger than 90° but less than 180°.
Define straight angle:
An angle of exactly 180°. Presents as a straight line.
Define reflex angle:
Always more than 180° (half a circle) but less than 360° (A full circle).
State the formula for the Pythagorean Theorem.
a2 + b2 = c2
Solve for C, if A is (4), and B is (3).
Use pythagorean’s theorem.
c2 = a2 + b2 c2 = 4^2 + 3^2 c2 = 16 + 9 c2 = 25 c2 = √25 ∴ c = 5
State the formula for perimeter of a rectangle:
p = L + L + w + w
State the formula for perimeter of a parallelogram:
p = b + b + c + c
State the formula for perimeter of a triangle:
p = a + b + c
State the formula for perimeter of a trapezoid:
p = a + b + c + d
State the formula for perimeter (circumference) of a circle:
c = πd
or
c = 2πr
State the formula for area of a rectangle:
A = Lw
State the formula for area of a parallelogram:
A = bh
