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Studentka2010 [4]
1 year ago
14

PLEASE HELP ME OUT PLEASE AND I WILL GIVE BRAINLIES!!!!!!

Mathematics
1 answer:
vodka [1.7K]1 year ago
3 0

that is so easy your answer is 21

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State whether the following statements are true or false, and explain your reasoning.
Masja [62]

Answer:

Step-by-step explanation:

a) A square is a rectangle.   True

Reason: Property of Rectangle: (i) Opposite sides are equal and parallel. (ii) Each angle is 90 (iii) Diagonals are equal and bisect each other.

A square hold all these properties. A square is  a rectangle.

b) A polygon with 21 sides has 432 possible diagonals. False

Reason: Number of diagonals of a polygon = \frac{n(n-3)}{2}

n --> number of sides of a polygon.

= \frac{21*18}{2} = 189 diagonals

c) All three angles in an Isosceles triangle are equal. False

Reason: In an isosceles triangle, two angles are equal.

If three angles are equal, then that is an equilateral triangle.

d) The measures of the exterior angles of a nonagon, a nine-sided figure, have a sum of 360°. True.

Reason: The sum of measures of the exterior angles  of any polygon is 360

6 0
3 years ago
Read 2 more answers
Please help me with my hw
stellarik [79]
Part 2 is 12.5 cm represents 5km
I worked this out by doing a ratio
5cm=2km
?cm=5km
you have to do 2 times 2.5 to get 5km so you do 5 times 2.5 to get 12.5cm
so the answer is that 12.5cm
6 0
2 years ago
A homeowner wants to include a semicircular patio at the end of a square sandbox. She knows that the area of the semicircular pa
stepladder [879]

Answer:

8cm

Step-by-step explanation:

First you must know that the diameter of the semi-circular patio is equal to the length of one side of the square

Area of a semi circle = πr²/2

25.12  = πr²

25.12 = 3.14r²/2

r² = 25.12(2)/3.14

r² = 16

r = √16

r = 4

Get the diameter

d = 2r

d =2(4)

d = 8cm

Hence the length of the side of the square is 8cm

6 0
2 years ago
Car and biker started to move towards each other.
Gnom [1K]

Answer :

1 4 4 0 0

E  x p l a i n i n g :

4 0
2 years ago
you must attend a minimum of 85% of the practices in order to play in the playoffs you have made 37 of the 42 practices will you
Deffense [45]
Yes, you'd be able to play.
37/42 = .88 = 88%
So you've attended more than 85% of the practices.
3 0
3 years ago
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