The road from P to Q makes a detour round a mountain. It first goes 6km from P on a bearing of 080◦ , then 7km on a bearing of 020◦ and finally 5km on a bearing of 295◦ to reach Q. There is a plan to bore a tunnel through the mountain from P to Q. It will be considered cost effective if it reduces the journey by more than 10km. Determine whether the tunnel should be built based on this information

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of

m∠abd = m∠dbc

step-by-step explanation:

given : ab bisects ∠dbc

as we know that bisection means ab divides   ∠dbc   in two equal angles named as   ∠dba and   ∠abc

so, m∠abd = m∠dbc  

because ab bisects ∠dbc.

hence , the first statement m∠abd = m∠dbc is true.