The similarities are they are all quadrilaterals. the differences are a rectangle has two different sets of equal side, a square sides are all right angles all the same size, and a rhombus has opposite equal acute angles.
Answer:
1) 
2) 
3) 
4) 
Step-by-step explanation:
1) Value of 
since sin45° = 1/√2
Therefore
2).Value of 
Since cos 30° = √3/2
Therefore
3). Value of 
since tan 60° = √3
therefore
4). Value of 
Since sin90°=1
Therefore
Answer:
và 
Step-by-step explanation:
Câu 1: V = 1/3.2a.
=
câu 2: Theo đề bài ta có SA là chiều cao và tam giác đáy SBC vuông tại S (hình chóp S.ABC đổi thành chóp A.SBC)
=> V = 1/3 SA.(diện tích tam giác SBC) = 1/3a.
=
Answer:
a cone
Step-by-step explanation:
If the base is circular, then the cone is said to be a "regular" or "circular" cone, much like an ice cream cone.
If the base is elliptical, then it becomes an "elliptical" cone.
Both shapes can be right (where the perpendicular line dropping from the vertex lands on the exact center of the base) or oblique (when the line dropping from the vertex doesn't land on the center of the base)
