This figure shows the placamat Kenneth made using two square pieces of paper measured in inches (in.). He cut one piece in half. 9 in. 6 in. 6 in. 9 in. 6 in. 6 in. What is the area, in square inches, of Kenneth's placemat? 42 inches squared 99 inches squared 54 inches squared 117 inches squared​

Ten times the square of a non-zero number is eqaul to ninety times the number

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)

Find all the angles that satisfy the equation cos(θ)=32