Work out the angle of BAD

m∠BAD = 88.83°

Step-by-step explanation:

By drawing a diagonal BD, we get a triangle ABD from the given rectangle pyramid.

Length of the diagonal BD (diagonal of rectangle BCDE) =

                                                                                              =

                                                                                              =

                                                                                              = 20 cm

By applying cosine rule in ΔABD,

BD² = AB² + AD²- 2(AB)(AD)cos(∠BAD)

20² = 14² + 14² - 2(14)(14)cos(∠BAD)

400 = 196 + 196 - 392cos(∠BAD)

400 - 392 = 392cos(∠BAD)

cos(∠BAD) =

m(∠BAD) =

               = 88.83°

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)

chase is right because he already been to the swings and he know how far it will be to get there

step-by-step explanation: