V ≈ 2.54 and the surface is 9 so
Answer: 482.8 sq cm
Step-by-step explanation:
The octagon is 8 isosceles triangles. Each has common side r and base 10. The central angle is 360/8 = 45°. By the Law of cosines,
10² = r² + r² - 2 r² cos 45° = 2r²(1 - √2/2) = r²(2-√2)
r² = 100/(2-√2)
The area of a triangle with sides a,b and included angle C is (1/2)ab sin C. Our 8 octagon isosceles triangles each have sides r and r and included angle 45° so our total area, 8 triangles, is
A = 8(1/2) r² sin 45° = (400/(2-√2)) (√2/2) × (2+√2)/(2+√2) = 200(1+√2)
A ≈482.84271
Answer: 482.8 sq cm
Step-by-step explanation:
3x+2x+10=180
5x+10=180
5x=170
x=34
so the value of x is 34
Hello!
When doing Sine, Cosine and Tangent the sides of the triangle tell you what to do
The hypotenuse is H
The bottom side is A
The Straight up and down side is O
For Sine you do O / H
For Cosine you do A / H
For Tangent you do O/ A
Put in the values you Sine
Sin A = 5/ 13
Put in the values for Cosine
Cos A = 12/ 13
The answer is A) Sin A = 5/ 13, cos A = 12/ 13
Hope this helps!
