the octagon shown below has eight congruent sides. the given measures of the octagon are rounded to the nearest
tenth of a centimeter.
11.6 cm
8.2 cm
28 cm
8.2 cm
- 28 cm
what is the area, to the nearest square centimeter, of the octagon?
a.
392
b. 487
c. 650
d. 720

Option C

Step-by-step explanation:

we know that

The area of the octagon can be divided in two trapezoids and one rectangle

so

The area of the octagon is equal to the area of the two trapezoids plus the area of rectangle

step 1

Find the area of one trapezoid

The area of one trapezoid is equal to

we have

substitute

step 2

Find the area of rectangle

The area of rectangle is

we have

substitute

step 3

Find the area of the octagon

Round to the nearest square centimeter

2

step-by-2step explanation:

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500