Answer:
18x-30+10x-5=28x-30
Step-by-step explanation:
Please Brainlist me
Answer:
114°
Step-by-step explanation:
The measure of an arc is double the measure of the angle between the chord and the tangent line.
Given:
The sides of the right triangular base measures 9 cm, 12 cm and 15 cm.
The height of the prism is 20 cm.
To find:
The surface area of a triangular prism.
Solution:
We know that, the area of a triangular prism is
![A=P\times h](https://tex.z-dn.net/?f=A%3DP%5Ctimes%20h)
Where, P is the perimeter of the triangular base and h is the height of the prism.
The sides of the right triangular base measures 9 cm, 12 cm and 15 cm. So, the perimeter of the right triangular base is
![P=9+12+15](https://tex.z-dn.net/?f=P%3D9%2B12%2B15)
![P=36](https://tex.z-dn.net/?f=P%3D36)
Now, the area of the triangular prism is
![A=36\times 20](https://tex.z-dn.net/?f=A%3D36%5Ctimes%2020)
![A=720](https://tex.z-dn.net/?f=A%3D720)
Therefore, the surface area of a triangular prism is 720 square centimetres.
Answer:
x = 8
y = 21
Step-by-step explanation:
The angle (7x + 12)° and the angle (12x-28)° are alternate interior angles and so has got the same measurement
7x + 12 = 12x - 28
12 + 28 = 12x - 7x
40 = 5x divide both sides by 5
8 = x
The sum of angle (12x - 28)° and (9y - 77)° must be equal because they make a straight line with the measure of 180°
12x - 28 + 9y - 77 = 180 we already found the value of x as 8 so let's rewrite the equation
12 × 8 - 28 + 9y - 77 = 180
96 - 28 - 77 = 180 add like terms
9y - 9 = 180
9y = 189 divide both sides by 9
y = 21
Answer:
I don't really know about this sorry sorry