Akal Pintar

正多边形 = poligon sekata 一个多边形的所有边都一样长，所有角都一样大，就是正多边形。左边的五边形每条边都有同样的红色记号，五个橙色角也一样大，所以是正五边形。右边的图形也有五条边，但边有长有短，角也有大有小，所以不是正多边形。 例子：正方形是“正四边形”，长方形的边不一样长，所以不是。 注意：判断时边和角两个条件都要检查。

regular polygon = poligon sekata A polygon whose sides are all equal and whose angles are all equal is a regular polygon. The pentagon on the left has the same red mark on every side and five equal orange angles, so it is a regular pentagon. The shape on the right also has five sides, but they are long and short and the angles differ, so it is not regular. Example: a square is a regular four-sided shape; a rectangle's sides are not all equal, so it is not. Watch out: check both conditions, the sides and the angles.

角的种类 = jenis sudut 正三角形的三个角都比直角小，是锐角；正方形的四个角刚好是直角；正五边形的五个角都比直角大，是钝角。边数越多，每个角张得越开。角的数目永远等于顶点的数目。 例子：一个正三角形的路牌有三个顶点，所以有三个锐角。 注意：同一个正多边形里，所有角都是同一种角。

kind of angle = jenis sudut The three angles of an equilateral triangle are smaller than a right angle, so they are acute; the four angles of a square are exactly right angles; the five angles of a regular pentagon are bigger than a right angle, so they are obtuse. The more sides, the wider each angle opens. The number of angles always equals the number of vertices. Example: an equilateral-triangle road sign has three vertices, so it has three acute angles. Watch out: in one regular polygon, every angle is the same kind.

正八边形 = oktagon sekata 正八边形有八个顶点，所以有八个角。每个角都张得比直角大，所以八个都是钝角。从正五边形开始，边数越多，角越大，但都是钝角。 例子：一个正十二边形的时钟外框，有十二个顶点和十二个钝角。 注意：正多边形的角再大，也不会张成一条直线。

regular octagon = oktagon sekata A regular octagon has eight vertices, so it has eight angles. Each angle opens wider than a right angle, so all eight are obtuse. From the regular pentagon onwards, more sides means bigger angles, but they are all obtuse. Example: a clock frame shaped like a regular twelve-sided polygon has twelve vertices and twelve obtuse angles. Watch out: however big the angles of a regular polygon get, they never open into a straight line.

数角并判断种类 = kira dan namakan sudut 这一题要回答两件事。第一，数一数图形有几个顶点，角的数目就和顶点一样多。第二，看任何一个角，和直角比较：比直角小、一样、还是比直角大？正多边形的每个角都一样，所以看一个就够了。 例子：正方形有四个顶点，四个角都是直角。 注意：数顶点时，在起点做个记号，绕一圈就停。

count and name the angles = kira dan namakan sudut This question asks two things. First, count the vertices; there are as many angles as vertices. Second, compare any one angle with a right angle: smaller, equal or bigger? Every angle of a regular polygon is the same, so checking one is enough. Example: a square has four vertices, and its four angles are right angles. Watch out: when counting vertices, mark where you start and stop after one full round.

找出角是钝角的正多边形 = cari poligon sekata bersudut cakah 先把每个名称换成边数，写在旁边。再回想教学屏的规律：正多边形的边数和每个角的大小有什么关系？然后把每一个名称都拿来对照这个规律，判断它的角比直角大还是不大，符合的才点。 例子：正十二边形有十二条边，它的每个角都比直角大。 注意：五个名称每一个都要判断一次，再按 Semak。

regular polygons with obtuse angles = cari poligon sekata bersudut cakah First turn each name into its number of sides and note it down. Then recall the rule from the teaching screens: how does the number of sides of a regular polygon relate to the size of each angle? Check every name against that rule, decide whether its angles are bigger than a right angle, and tap only those that fit. Example: a regular twelve-sided polygon has twelve sides, and each of its angles is bigger than a right angle. Watch out: judge all five names before pressing Semak.