In ∆ABC , if B= 60° , C = 3cm and A = 12cm . what is the area of ∆ABC?​

9514 1404 393

  15.6 cm²

Step-by-step explanation:

The area is given by the formula ...

  area = 1/2ac·sin(B) = 1/2(12 cm)(3 cm)sin(60°) ≈ 15.58846 cm²

The area of ΔABC is about 15.6 cm².

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25

an = 22 + (n-1) *6

110 seats

step-by-step explanation:

an=a1+(n-1)(d)

a1 = 22   this is the first item in the sequence

d =6   this is how the sequence goes up

a)   an = 22 + (n-1) *6

b) a12 = 22 + (12-1) *6

    a12 = 22+11*6

  a12 = 22 +88

  a12 = 110