Which statements are true? Check all that apply. If a figure has point symmetry, it also must have rotational symmetry.
If a figure has rotational symmetry, it also must have point symmetry.
If a figure has point symmetry, it also must have 4-fold reflectional symmetry.
All parallelograms have point symmetry.
A triangle never has point symmetry.

The answers are

A) If a figure has point symmetry, it also must have rotational symmetry  

D) All parallelograms have point symmetry

E)  A triangle never has point symmetry

on Edge 2020

3, 12, 48, 384, 1536, 6144, 24576, 98304

step-by-step explanation:

just keep timing it by 4.

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240