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°

3/6   and 9/18

step-by-step explanation:

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.