To how many significant figures should each answer be rounded? a) (6.62610^-34 js)(2.997910^8 m/s) / 4.07010^-7 m = 4.880610663391*10^-19 j(unrounded)b) (6.02210^23 atoms/mol)(0.589 g) / 20.18 g/mol = 1.75810^22 atoms (unrounded)

a) after rounding: 4 significant figures.

b) after rounding: 3 significant figures.

Step-by-step explanation:

Significant figures are the number of needed place values for accuracy. The product or quotient of numbers with significant figures must be rounded to the least amount present within the problem.

a) (6.62610^-34 Js)(2.997910^8 m/s) / 4.07010^-7 m = 4.880610663391*10^-19 J

4.880610663391*10^-19  rounds to 4.880 * 10^-19 since the least number of significant digits is 4 within the problem.

b) (6.02210^23 atoms/mol)(0.589 g) / 20.18 g/mol = 1.75810^22 atoms

1.75810^22 rounds to 1.76 *10^22 since the least number of significant digits within the problem is 3.

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.