The surface area is 216 cm sq.
Square base formula: length * width
One square base is 70 cm sq (7*10), another is 56 cm sq (7*8), and the final base is 42 cm sq (7*6).
The height of both triangular faces is 4.8 cm
The two triangular faces are 24 cm sq each, 48 cm sq when added together.
Add all 5 numbers up to get 216.
X² + 18x + 79 = 0
x = <u>-(18) +/- √((18)² - 4(1)(79))</u>
2(1)
x = <u>-18 +/- √(324 - 316)</u>
2
x = <u>-18 +/- √(8)
</u> 2<u>
</u>x = <u>-18 +/- 2√(2)
</u> 2<u>
<em /></u><em />x = -9 <u>+</u> √(2)
x = -9 + √(2) x = -9 - √(2)
We need to see the puzzles in an attachment or something to answer this question
please use my image as a reference (figure not drawn to scale).
AB is a straight line and the angle of a straight line = 180°
so that means 
, solve for 
:
combine like-terms
°
if you want to make sure of the answer, plug in in the equation:
Answer:
69π m^2
Step-by-step explanation:
surface area of cylinder= 2πrh+2πr^2
However, the cylinder is open top
Therefore, the outer surface area of the cylinder
=2π(6/2)(10)+π(3)^2 m^2
=60π+9π m^2
=69π
