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2 years ago

How many triangles are there?

Mathematics

2 answers:

Thepotemich [5.8K]2 years ago

8 0

Answer:

Steps-by-step explanation:

sorry mistake

Igoryamba2 years ago

8 0

Answer:

Explanation: I just counted them! :) and there was 6 in the middle and on the outside so 6 + 6 = 12! :)

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Tessellations

hram777 [196]

Answer:

A. Yes

Step-by-step explanation:

I calculated it logically

6 0

3 years ago

Read 2 more answers

A) Find the area<br>B) Find the perimeter

Archy [21]

Answer:

A1= 64

A2= 40

P= 56(of whole shape)

Step-by-step explanation:

A squares area is a side squared so 8^2= 64, and it is also shown that a side of the square is the base of the parallelogram. The area of a parallelogram is b*h so (square side)(8) * height(5)= 40.

Since a parallelograms opposite sides are congruent, 8+8=16, and the other two sides need to be congruent and equal to 40-16(24), therefore the sides are both 12.

Then to calculate the perimeter just count up the side lengths, 8+8+8+12+8+12=56

4 0

3 years ago

1. Bob tried to answer the following question by finding the missing angle and rounding the answer to the nearest degree.

iren2701 [21]

Answer:

Part 1)

Bob's mistake was to have used the cosine instead of the sine

The measure of the missing angle is $53.13\°$

Part 2) The surface area of the pyramid is $288\ cm^{2}$

Step-by-step explanation:

Part 1)

Let

x----> the missing angle

we know that

In the right triangle o the figure

The sine of angle x is equal to divide the opposite side angle x to the hypotenuse of the right triangle

$sin(x)=\frac{16}{20}$

$x=arcsin(\frac{16}{20})=53.13\°$

Bob's mistake was to have used the cosine instead of the sine

Part 2) we know that

The surface area of the square pyramid is equal to the area of the square base plus the area of its four lateral triangular faces

$SA=b^{2}+4[\frac{1}{2}(b)(h)]$

where

b is the length side of the square

h is the height of the triangular lateral face

In this problem

$h=b/2$ -------> by an 45° angle

$b=2h$

$sin(45\°)=\frac{h}{6\sqrt{2}}$

$h=6\sqrt{2}(sin(45\°))=6\ cm$

Find the value of b

$b=2(6)=12\ cm$

Find the surface area

$SA=12^{2}+4[\frac{1}{2}(12)(6)]=288\ cm^{2}$

3 0

3 years ago

Joe ran 3 miles yesterday and wants to run at least 12 miles this week. Write an inequality that can be used to determine the ad

ivanzaharov [21]

Answer:

3 + x >= 12

not sure what variable your using

Its the > sign with the _ under

8 0

2 years ago

PLEASE help!! I need help with this quick!!!! I partly know how to do this, but not 100%. Use the linear combination method to s

ira [324]

Add the equations in order to solve for the first variable. PLug this value into the other equations in order to solve for the remaining variables.
The answer is:
(2, -3)

5 0

3 years ago