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2. Degree (angle) - Wikipedia

   en.wikipedia.org/wiki/Degree_(angle)

   A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a measurement of a plane angle in which one full rotation is 360 degrees. [4] It is not an SI unit—the SI unit of angular measure is the radian—but it is mentioned in the SI brochure as an accepted unit. [5]

3. Sum of angles of a triangle - Wikipedia

   en.wikipedia.org/wiki/Sum_of_angles_of_a_triangle

   An easy formula for these properties is that in any three points in any shape, there is a triangle formed. Triangle ABC (example) has 3 points, and therefore, three angles; angle A, angle B, and angle C. Angle A, B, and C will always, when put together, will form 360 degrees. So, ∠A + ∠B + ∠C = 360°

4. 360-degree video - Wikipedia

   en.wikipedia.org/wiki/360-degree_video

   360-degree videos, also known as surround video, [1] or immersive videos [2] or spherical videos, [3] are video recordings where a view in every direction is recorded at the same time, shot using an omnidirectional camera or a collection of cameras.

5. Angle - Wikipedia

   en.wikipedia.org/wiki/Angle

   The angle expressed by another angular unit may then be obtained by multiplying the angle by a suitable conversion constant of the form ⁠ k / 2 π ⁠, where k is the measure of a complete turn expressed in the chosen unit (for example, k = 360° for degrees or 400 grad for gradians):

6. Video lesson - Wikipedia

   en.wikipedia.org/wiki/Video_lesson

   The format may vary. It might be a video of a teacher speaking to the camera, photographs and text about the topic or some mixture of these. Animated video lessons, in particular, use engaging visuals and simplified explanations to help break down complex topics, making them especially effective in subjects like Science or Math. [1]

7. 360 (number) - Wikipedia

   en.wikipedia.org/wiki/360_(number)

   360 is a triangular matchstick number. [4] 360 is the product of the first two unitary perfect numbers: [5] = There are 360 even permutations of 6 elements. They form the alternating group A 6. A turn is divided into 360 degrees for angular measurement. 360° = 2 π rad is also called a round angle.

8. Circle - Wikipedia

   en.wikipedia.org/wiki/Circle

   The angle subtended by a complete circle at its centre is a complete angle, which measures 2 π radians, 360 degrees, or one turn. Using radians, the formula for the arc length s of a circular arc of radius r and subtending a central angle of measure 𝜃 is s = θ r , {\displaystyle s=\theta r,}

9. Internal and external angles - Wikipedia

   en.wikipedia.org/wiki/Internal_and_external_angles

   The sum of all the internal angles of a simple polygon is π(n−2) radians or 180(n–2) degrees, where n is the number of sides. The formula can be proved by using mathematical induction : starting with a triangle, for which the angle sum is 180°, then replacing one side with two sides connected at another vertex, and so on.