The area of a rectangle is calculated by multiplying its length by its width. For a piece of paper measuring 21 cm by 15 cm, the area is 21 cm × 15 cm, which equals 315 square centimeters.
No, you cannot wrap a 15cm by 10cm by 10cm box using a single sheet of A4 paper. An A4 sheet measures 21cm by 29.7cm, which is not large enough to cover the surface area of the box completely. The surface area of the box is 2(15cm × 10cm + 10cm × 10cm + 15cm × 10cm) = 2(150cm² + 100cm² + 150cm²) = 2(400cm²) = 800cm², while an A4 sheet provides a limited area of 623.7cm².
29.7cm by 21cm
A = 1385cm2
A = 346.36 cm2
A = 1,385.4 cm2
No, you cannot wrap a 15cm by 10cm by 10cm box using a single sheet of A4 paper. An A4 sheet measures 21cm by 29.7cm, which is not large enough to cover the surface area of the box completely. The surface area of the box is 2(15cm × 10cm + 10cm × 10cm + 15cm × 10cm) = 2(150cm² + 100cm² + 150cm²) = 2(400cm²) = 800cm², while an A4 sheet provides a limited area of 623.7cm².
29.7cm by 21cm
A = 1385cm2
Approx 29.7cm x 21cm
A = 1,385.4 cm2
A = 346.36 cm2
area of a circle and the question is d=21cm
Yeah, its 21cm x 29.7cm
Area of the base of a cylinder = pi*radius2
The surface area of a box 15cm x 12cm x 8 cm is 2 times 15cm times 12cm, plus 2 times 15cm times 8 cm, plus 2 time 12cm times 8 cm, or 792cm2. However, this is only the surface area - the actual wrapping paper required would depend on the method of wrapping and how much overlap is desired. Since you would not want to splice the paper, you certainly would need more that 792cm2 but, again, that depends on your wrapping style.
The surface area of a cylinder where height is 80cm and radius is 15cm equals 8953.54cm2
Only if it's 3cm high!