In 1906 and earthquake in San Francisco was estimated to measure 7.8 on the Richter scale and earthquake off the coast of north Sumatra in 2040 caused a tsunami that affected many people living in countries close to the Indian ocean this earthquake was 20 more times as intense as the San Francisco earthquake find its mothers sure on the Richter scale

1,150 give brainliest

step-by-step explanation

2r= 2300

r =1150

1/2*qr*rs

step-by-step explanation:

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet