Question

The white square in the drawing below is located in the centre of the grey rectangle and has a surface area of A. The width of the rectangle is twice the width a of the square. What is the surface of the grey area (without the white square)?

Answer 1

Answer:

$2.y { { { { { { { { { { { { { { { { { \sqrt[ \sqrt[ \sqrt[ \sqrt[ \sqrt[ \sqrt[ \sqrt[ \sqrt[ \sqrt[ \sqrt[ \frac{ {yy | | | | | | | {?}^{?} | | | | | | | }^{?} }{?} \times \frac{?}{?} \times \frac{?}{?} \times \frac{?}{?} \times \frac{?}{?} ]{?} ]{?} ]{?} ]{?} ]{?} ]{?} ]{?} ]{?} ]{?} ]{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?} }^{?}$

Answer 2

Step-by-step explanation:

s important to be able to measure and calculate surface areas. It might be necessary to calculate, for example, the surface area of the cross-section of a canal or the surface area of a farm.

This Section will discuss the calculation of some of the most common surface areas: the triangle, the square, the rectangle, the rhombus, the parallelogram, the trapezium and the circle (see Fig. 1a).

Fig. 1a. The most common surface areas



The height (h) of a triangle, a rhombus, a parallelogram or a trapezium, is the distance from a top corner to the opposite side called base (b). The height is always perpendicular to the base; in other words, the height makes a "right angle" with the base. An example of a right angle is the corner of this page.

In the case of a square or a rectangle, the expression length (1) is commonly used instead of base and width (w) instead of height. In the case of a circle the expression diametre (d) is used (s