The diameter of a circle is 9 m. Find the circumference \textit{to the nearest tenth}to the nearest tenth.

Mathematics

1 answer:

vredina [299]2 years ago

8 0

Answer:

$C=28.3m$

Step-by-step explanation:

From the question we are told that:

Diameter $d=9m$

Radius $r=4.5m$

Generally the equation for Circumference of a circle is mathematically given by

$C=2\pi r\\\\\C=2*\pi*4.5m$

$C=28.3m$

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prove that the quadrilateral whose vertices are the points A(-1,1), B(-3,4), C(1,5) and D(3,2) is a parallelogram.

Vsevolod [243]

Answer:

Since $\overrightarrow{AB} = \overrightarrow{DC}$ and $\overrightarrow{AD} = \overrightarrow{BC}$ , then the quadrilateral ABCD is a parallelogram.

Step-by-step explanation:

First, we label each point of the quadrilateral with the help of a graphing tool. If the quadrilateral ABCD is a parallelogram, then $\overrightarrow{AB} = \overrightarrow{DC}$ and $\overrightarrow{AD} = \overrightarrow{BC}$ . If we know that $A(x,y) =(-1, 1)$ , $B(x,y) =(-3,4)$ , $C(x,y) = (1,5)$ and $D(x,y) = (3,2)$ , then the measure of each vector is, respectively: