Can someone teach me how to solve these type of questions

499.2

Step-by-step explanation: you need to work out the area of one triangle first. With the equation 1/2 times base times height we can do that. Using the formula, the area of 1 triangle is 62.4. As this is a octahedron, we multiply 62.4 by 8, thus getting 499.2

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.