The length of a book cover is 28.3 cm and the width of the book cover is 21 cm. What is the minimum width?explain

The minimum width of the book = 20.9 cm

Step-by-step explanation:

The length of the book cover = 28.3 cm

The width of the book cover = 21 cm

Given that the uncertainty in measurement should be included due to the likelihood of error in measurement, the uncertainty in measurement can be presented as follows;

Measurement = (Best estimate + Uncertainty) units

Whereby the display of the measuring device is limited to one decimal place, we can have the measurement of the width, w, as follows;

Width of the book = (21 ± 0.1) cm

The range of the width of the book is therefore 20.9 cm to 21.1 cm

The minimum width of the book = 20. cm

Heya!

Here is your

The measure of all angles are 60°.

Here,

triangle ABC is an equilateral triangle (all sides are equal)

so, Its all angle measure same.

<A + <B + <C = 1800°

let <B = x

x+x+x =180°

3x = 180

x= 60°

Hence
<B = 60°