The diagonal intersection of the regular quadrilateral pyramid is equilateral triangles with surface 16√3. a) Unify the total surface of the pyramid.

b) Unify the volume of the pyramid

c) Find the measure of the angle formed by the side ribs with the plane of the base

d) Find the measure of the angle formed by the side plane with the base plane.​

55

step-by-step explanation:

180 square centimeters

step-by-step explanation:

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500