What is the measure of the central angle of a circle with a radius 20 cm that subtends an arc whose length is 35(pi) cm

The measure of the central angle is 315°  

Step-by-step explanation:

The formula of the length of an arc of a circle is L = × 2πr, where x is the central angle subtended by this arc and r is the radius of the circle

∵ The radius of the circle is 20 cm

∴ r = 20

∵ The length of the arc is 35π cm

∴ L = 35π

- Substitute the values of R and L in the formula above

∵ 35π = × 2π × 20

∴ 35π =   × 40π

∴ 35π =   π

- Divide both sides by π

∴ 35 =  

- Multiply both sides by 9

∴ 315 = x

∴ The measure of the central angle is 315°  

step-by-step explanation:

compare

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