The shape of a garden is rectangular at the center and semicircular at the ends. Find the area and perimeter of this garden { le
ngth of the rectangle is 20 - (3.5+3.5) meters} The First, correct answer gets BRAINLIEST
2 answers:
Mensuration:
Mensuration is the branch of mathematics which concerns itself with the measurement of Lengths, areas & volume of different geometrical shapes or figures.
Plane Figure: A figure which lies in a plane is called a plane figure.
For e.g: a rectangle, square, a rhombus, a parallelogram, a trapezium.
Perimeter:
The perimeter of a closed plane figure is the total length of its boundary.
In case of a triangle or a polygon the perimeter is the sum of the length of its sides.
Unit of perimeter is a centimetre (cm), metre(m) kilometre(km) e.t.c
Area: The area of the plane figure is the measure of the surface enclose by its boundary.
The area of a triangle are a polygon is the measure of the surface enclosed by its sides.
A square centimetre (cm²) is generally taken at the standard unit of an area. We use square metre (m²) also for the units of area.
Circumference of a circle is the perimeter of a circle.
In a circle the radius is half of the diameter.
The approximate value of π( Pi) is= 22/7
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The length of the sides,MD, DK, and KM gives the measure of the angle m<D as c) 76°
<h3>Which method can be used to find the measure of angle m<D?</h3>In triangle ∆MDK, we have;
m = 16.4
d = 22
k = 19
Using cosine rule, we get;
d² = m² + k² - 2•m•k•cos(D)
Therefore;
2•m•k•cos(D) = m² + k² - d²
Which gives;
- m<D = 76°
The correct option is therefore;
- c) 76°
Learn more about the rule of cosines here:
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