fragment_bentuk_rumus.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".BentukRumus">

    <!-- TODO: Update blank fragment layout -->
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
  >

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="220dp"
        android:layout_margin="16dp">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            >

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Persegi"
                android:textAlignment="center"
                android:textSize="19sp"
                android:textColor="#000"
                android:layout_marginBottom="10dp"
                />

            <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/txt_persegi"
            android:textAlignment="center"
            />

        </LinearLayout>

    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="220dp"
        android:layout_margin="16dp">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Segitiga"
        android:textAlignment="center"
        android:textSize="19sp"
        android:textColor="#000"
        android:layout_marginBottom="10dp"

        />

        <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/txt_segitiga"
android:textAlignment="center"
    />
</LinearLayout>
    </android.support.v7.widget.CardView>

</LinearLayout>
</FrameLayout>